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JuJu, I built a garage with an upstairs room with a similar situation with 4ft knee walls on each side and the long open space in the middle that will be heated as a guest room.
As HayZee stated at about 7 ft I put in "collar ties" to make a flat ceiling in the center.
I then put in what is known as "proper Vent" to insure air flow from the knee wall space to the top attic space.
Then put 6 inch insullation over all.
NOW, I can not stress enough the importance of getting air flow from the eves of you home to the very top of the roof.
I assume you have eve vents under the sofit of the home? Outside Air must be able to flow from this sofit to the top attic then out via either ridge vent or gable end vents.
This will prevent condensation and dry rot of rafters and insure that snow on the roof will slide off and not build up an ice dam in the winter and leaking into the house.
Gerry
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